Seal for furnace chambers of boilers



N. E. LEWIS.

SEAL FOR FURNACE CHAMBERS 0F BOILERS.

APPLICATION FILED OCT- 22, 1919.

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N. E. LEWIS. SEAL FOR FURNACE CHAMBERS 0F BOILERS.

APPLICATION FILED 001. 22. 1919.

Patented Jan. 10, 1922.

2 SHEETSSHEET 2.

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IN V EN TOR.

entree sures PATENT oer-ice.

NATHAN E. LEWIS, OF PLAINFIELD, NEW JERSEY, ASSIGNOR T0 BAJBCUUL on WILOOX COMPANY, 33mm.

0] BAYONNE, NEW JERSEY, A GOBIEORATION OF NEW SEAL FOB FURNACE GHAM TBERS- OF BOW.

neonate.

' specification of Letters Patent.

Patented Jan. 10, 1922.

Application filled Gctoter 2%, i919. fierlal E0. 832,529.

been built, where the furnace wall extended to the boiler tubes and formed a seal with a bafie construction, the dificulty has been experienced that the upper end or the wall has,

under the intense heat of the furnace, had a tendency to lean or fall forwardly, thereby breaking the seal and permitting the gases from the furnace chamber to oassthrough.

the openin thus formed and impinge against the metal ramework of the setting, thereby not only reducing the efliciency of the boiler, because of the failure of part of the gases to pass over the boiler tubes, but warpmg or otherwise injuring the metal parts or the boiler settin i In accordance with my present invention an inclined plate extends from the main furnace wall to the headers, or other parts of the boiler, forming a sliding joint therewith, and making a permanent seal for the furnace chamber, the plate preferably being movable independentl of t e wall.

My invention will est be understood by reference to the accompanyin drawings, in which the same parts are indicated by the same reference characters and in which Figure l is a longitudinal sectionthrough a portion of a steam boiler of the Babcock & Wilcox type embodying my invention; 2 is a detail view of a section of the boiler shown in Fig. 1 to a larger scale, and Fig. 3 is a view similar to Fig. 1 showin a modification.

ferrinp now to the drawings and first to Fig-e 1, is the setting of a steam boiler comprising front and rear furnace walls 2 and 3, respectively. The rear wall 3. is preferabl rovided with an o 4 afior access 8) the stoker and cib sed by a doo r o The stoker, which is here shown as of the underfeed ty%e, is indicated by the reference numeral he water tubes 7 are horizontally incllned in accordance with the usual Babcock & Wilcox construction, and are here shown as comprising an upper bank of tubes 7 and a lower bank 7", course be understood that my invention is equally applicable to a Water tube boiler in which the water tubes are not so divided. In the construction shown in Fi 1 the lower bank of tubes 7 comprises on the lower row of tubes. The tubes 7 o the up er bank are connected to downtake hea ers 8, and to uptake headers 9, while the lower bank 7* is connected to a box or header 10 which is nippled to the header 8, as at 1.1, the other end of the tubes 7" being connected to a box or header 12 nippled to the header 9, as at 13. A mud drum 14 is located beneath though it will of The bathe-construction for directing the furnace gases across the boiler tubes comprises a roof baflie 16 extending rearwardly from the header 10 above the lower bank of water tubes 7 b and also comprises a vertical section 17 extending from the rear end of the roof bafile 16 across the rapper bank of tubes 7 and across the secon ar combustion cham ber 18 which is forme between the lower and upper banks of tubes.

In accordance with my present invention an inclined plate 19 extends upwardly from the main furnace wall 2 and leans against boiler parts, here illustrated as the header 10, and forms a sliding joint therewith, and

makes a seal for the furnace chamber tween the up or end of the wall, 2' and, as the roof bafig 16 eng the header 10, the roof bafile 16. This s iding joint formed between the plate and the header or the boiler is an im ortant feature of my invention, as when the boiler is heated, the lowermost ends of the downtake headers expand downwardly through the fact that the boiler is suspended from above. The action of the heat on the furnace brickwork also tends to raise the plate or plates forming the seal so that altogether there may be a substantial relative movement between the two parts. The lower end of the plate 19 is seated on a member that is stationary with reference to the boiler setting, this member in Figextends upwardly from the upper ures l and 2 comprising an angle iron 20 which is secured by a bolt or bolts 21 and nuts 22 to the metal framework of the setting so that the bottom of the plate is p1votally mounted on a stationary member and can move forwardly or baclrwardly thereon.

ln the form of my invention here illustrated, the plate 19 and the parts including the mud drum to the rear of the same, are protected by an auxiliary wall which A end of the main furnace wall 2 substantially to the tiling surrounding the front ends of the boiler tubes 7 a space being formed between the two which is filled with yielding material such as asbestos. layer of heat-insulating material, such as magnesia, 25, is also preferably interposed between the auxiliary wall and the plate 19,

in Figure 3 of the dfawing l have shown the lower end of the plate 19 seated. in a sta tionary drip pan 2% on the top of be main wall 2. In this figure I have indicated parts corresponding to those of Figures 1 and 2, but which are slightly mo ed, by corre sponding reference characters with the clraracter a appended, The wall 2 is in form provided with tile loci: 2'? sinr lar to that illustrated in an application of David S, e aoobus, Serial lo, 90,058, which was filed in the Patent *Dffice on or about April 10, 1915., in form here shown the lower haul; of er tu es '2' comprises the two lower it will be apparent, in accordance with my invention, the plate 19 will always form a seal between upper end of the wall 2- and the headers 10 or other boiler parts, even where the auxiliary wall 23 when such is used, leans or falls forwardly away from the plate 19, Such a seal is especially useful where under-feed stolrers are used, and where at the high ratings that must often be carried, the pressure within the furnace may exceed the atmospheric pressure through the operation of the forced blast used in connection with the stoker, that is, there may be a plus pressure within the furnace instead of a minus pressure or draft suction.

What l claim and desire to secure by Letters Patent of the United States is 1, In combination with a steam boiler of the water tube type, a furnace comprising a wall, and a plate extending upwardly from said wall and movable independently there of and forming a sliding joint with boiler parts.

2; In a boiler of the water tube type having vertically extending downtake headers, a furnace wall below the headers, and a plate extending upwardly from said wall and movable independently thereof and forming a sliding joint with said downtake headers.

3. In combination with a steam boiler of the water tube type, a furnace comprising a racer/7e wall, and a pivoted plate extending upwardly from said wall and forming a slid-- ing joint with boiler-parts to form a seal for the furnace chamber.

4. In combination with a steam boiler of the water tube type, a furnace comprising a wall, and a plate extending upwardly from said wall and movable independently thereof and forming a sliding joint with boiler parts, said plate forming a seal for the furnace chamber.

5. In combination with a steam boiler of the water tube type, a furnace comprising a wall, and a plate extending upwardly from said well and leaning agaist the headers of the boiler and forming a sliding joint therewith to make a seal for the furnace chamber.

6. In combination with a steam boiler of the water tube type, a furnace comprising a wall, and a plate extending upwardly from said wall and leaning rearwardly against a header and forming a sliding joint therewith, said plate forming a seal for the fur-- nace chamber.

7. In combination with a steam boiler of the water tube type, a furnace comprising a wall extending substantially to the boiler tubes and comprising a main wall and an auxiliary wall leaning rearwardly, and a plate at the rear of the auxiliary wall but separate therefrom, said plate forming a sliding joint with boiler parts.

8. In a steam boiler of the water tube type, a furnace comprising a wall, boiler tubes located above and exposed to said furnace, and means for sealing the space between said wall and the lowermost tubes comprising a plate extending upwardly from said wall and movably independently thereof and slidably engaging boiler parts.

9. In combination with a steam boiler of the water tube type, a furnace comprising a wall, and a plate extending upwardly from said wall and forming a sliding joint with a header, and a roof baffle extending roan wardly from said header.

10. In combination with a steam boiler of the water tube type, a furnace comprising a wall extending substantially to the boiler tubes and comprising a main wall and an auxiliary wall leaning rearwardly, and a plate at therear of the auxiliary wall but separate therefrom and forming a support for said plate forming a sliding joint with boiler parts.

11. In a water tube boiler and its setting, a furnace chamber enclosed at least in part by a furnace wall, water tubes located above said furnace chamber, some of the lower-o most tubes being exposed to said chamber for substantially their entire length, headers to which said tubes are connected, and means for sealing the space between said wall and said tubes comprising a plate extending uplowermost tubes being exposed to said chamher for substantiall their entire length, headers to which said tubes are connected, and 'means for sealing the space between said wall and said tubes comprising a plate extending upwardly from said wall short of said tubes and forming a sliding jointwith headers of the boiler.

13. In a water tube boiler and its setting, a furnace chamber enclosed at least in part by a main furnace wall, water tubes located above said furnace chamber, some of the lowermost tubes being exposed to said chamber forsubstantially their entire ,length, headers to which said tubes are connected, means for sealing the space between said wall and said tubes comprising a plate ex- I tendin upwardly from said wall and forming a s iding joint with headers of the boiler,

and an auxiliary wall sup orted on said main wall and located at t e rear of said plate.

14. In a water tube boiler and its setting, a

furnace chamber enclosed at least in part by' a main furnace' wall, water tubes located above said furnace chamber, some of the lowermost tubes being exposed to said cham' ber for substantially their entire length, headers to which said tubes are connected, and means for sealing the space between said wall and said tubes comprising a plate extending upwardly from said wall and leaning a ainst the headers of the boiler.

15. n a water tube boiler'and its setting, a furnaceg'chamber enclosed at least in'part b a main furnace wall, water tubes located a ove said furnace chamber, some of the' lowermost tubes being exposed to said cham her for substantially their entire length, headers to which said tubes are connected,

means for sealing the space between said wall and said tubes comprising a plate extending upwardly from said wall and leaning against theheaders of the boiler, and an auxiliary wall resting on said main wall and leaning against said plate.

16. In a steam boiler and its setting, a furnace chamber enclosed at least in part by a furnace wall, an underfed stoker for said furnace, boiler tubes located above said furnace chamber some of which areexposed for substantially their entire length to said chamber, and means for sealing the space between said wall and the lowermost tubes comprising a plate extending upwardly from said wall and leaning against, boiler parts. 7 a

17. In a steam boiler and its setting, a furnace chamber enclosed at least in part by a furnace wall, an underfeed stoker for said furnace, boiler tubes located above said furnace chamber, some of which are exposed for substantially their entire length to said chamber, means for sealing the space between said wall and the lowermost tubes comprising a plate extending upwardly from said wall and leanillrg against boiler parts, and an auxiliary wa resting on said furnace wall and leaning against said plate.

In testimony whereof I have. hereunto signed my name in the presence of two subscribing witnesses.

HERMAN .B. Siam, JOHN A. W. Dixon. 

